2002 blazer xtreme motor won't start on first try but 99 out…

2002 blazer xtreme motor won't start on first try but 99 out of 100 on second try

Mechanic's Assistant: Have you checked the battery, particularly the terminal connections? Are they corroded?

New battery and twice cleaned cable terminals

Mechanic's Assistant: Are you fixing your Blazer yourself? What have you tried so far?

Fuel pump relay ok checked as many grounds as possible ,turn key to on posisititon can hear fuel pump run for couple of seconds turn to run won't start turn key to on second time fuel pump comes on and has a deeper sound , and will start no problem

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

1- fuel pump weal not uo to specs it needs to be between 60 to 66 psi on theses blazer

2- Fuel injectors one or more leaking and when turn switch off the pump will prime fuel rail again bring it up to the\at level it needs

3- fuel pressure regulator a tiny crack causing diaphragm to leak down and taking pressuer down for split second causing a small variation in pressure , which you shooting starting fluid kind confirm adding fuel is fixing it at start up but why is what we need to find out between the 3 possibilties to be accurate and not throwing parts at it

lick on link to view the Fuel testing steps and gauge needed , ,Fuel specs and a Fuel Diagnostic table for fuel issue to help you trouble shoot

with all that said the fuel pump most likely weak, most common but that does not mean, injector, or regulator , fuel filter if not replace replace and retest pressure ,vacuum on the regulator make sure no leaks , check also important .

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.